/**
 * OLAT - Online Learning and Training<br>
 * http://www.olat.org
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); <br>
 * you may not use this file except in compliance with the License.<br>
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing,<br>
 * software distributed under the License is distributed on an "AS IS" BASIS, <br>
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
 * See the License for the specific language governing permissions and <br>
 * limitations under the License.
 * <p>
 * Copyright (c) since 2004 at Multimedia- & E-Learning Services (MELS),<br>
 * University of Zurich, Switzerland.
 * <p>
 */
package org.olat.core.gui.render;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import org.junit.Test;

/**
 * Description:<br>
 * downloads the entry page from olatng.uzh.ch and checks if the response
 * headers are sent with proper cache control entries like:
 * Cache-Control: max-age=31536000, public
 * This allows browsers to cache static resources and minimize traffic which returns 304 (not modified). 
 * If the tests fails make sure that http.conf from apache has the following entry
 * 
 * <FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$"> 
 *	Header set Cache-Control "max-age=31536000, public" 
 * </FilesMatch>
 * 
 * <P>
 * Initial Date: 17.01.2011 <br>
 * 
 * @author guido
 */
public class TestRenderStaticURLCacheHeaders {

	private String uri = "https://olatng.uzh.ch/";

	@Test
	public void cacheHeaders() throws IOException, MalformedURLException {
		URL url = new URL(uri + "olat/dmz/");
		HttpURLConnection uc = (HttpURLConnection) url.openConnection();

		assertEquals(200, uc.getResponseCode());
		assertEquals(true, uc.getContentType().startsWith("text/html"));
		BufferedReader in = new BufferedReader(new InputStreamReader(uc
				.getInputStream()));
		String inputLine;
		// grab the first url that points to an static resource to check headers
		while ((inputLine = in.readLine()) != null) {
			if (inputLine.contains("src=\"/olat/raw/")) {
				//System.out.println("Found line: " + inputLine);
				break;
			}
		}
		in.close();

		String jsUrl = inputLine.substring(inputLine.indexOf("src=\"") + 6,
				inputLine.lastIndexOf("\""));
		assertTrue(jsUrl.startsWith("olat/"));
		url = new URL(uri + jsUrl);
		uc = (HttpURLConnection) url.openConnection();
		assertEquals(200, uc.getResponseCode());
		// the cached elements in olat e.g. js, css ... should have an cache
		// lifetime of one year
		assertEquals("max-age=31536000, public", uc.getHeaderField("Cache-Control"));

	}

}